Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Solar Images Friday, 11 April 2025

‹ 10.04.2025 2025 13.04.2025 ›

Photosphere sunspot drawing and RDS evaluation

11.04.2025 photosphere drawing

High-resolution scan (3231 px)

Time
07:10 UT
Observer
Ergün EGE
g
8
f
45
R
125
Seeing
3 / 5

Sunspot groups and observation details →

Sunspot groups (from the drawing)

Group 1 · BXI – 7Group 1 · BXI – 7 Group 2 · DKC – 18Group 2 · DKC – 18 Group 3 · AX_ – 4Group 3 · AX_ – 4 Group 4 · BXO – 2Group 4 · BXO – 2 Group 5 · DAO – 5Group 5 · DAO – 5 Group 6 · AX_ – 1Group 6 · AX_ – 1 Group 7 · CSO – 6Group 7 · CSO – 6 Group 8 · HS_ – 2Group 8 · HS_ – 2
RDS data file (.gzd) 
[Gözlem]
Tarih=11.04.2025
Saat=07:10
Gözlemci=Ergün EGE
KontrolEden=Korhan YELKENCİ
Durumaçısı=-26.18
Enlemaçısı=-5.89
Boylamaçısı=195.25
Boylamfark=3
GKalite=3
GDurum=G.T
Kuzeyaçısı=-0.1
Sırano=20222
AyRasatNo=6
RasatÖnceki=10.04.2025
RasatSonraki=13.04.2025

[Leke Grupları]
Grupsayısı=8:5:3
LekeSayısı=45:36:9
RölatifSayı=125:86:39
01=BXI 07 +17.397 +40.969 236.219 +0.000 0000 0 +18.292 +45.621 +16.503 +36.317 +17.397 +45.421 +17.397 +36.517
02=DKC 18 +07.179 +39.625 234.875 +0.000 0000 0 +09.150 +44.732 +05.343 +34.519 +07.179 +44.532 +07.179 +34.719
03=AX_ 04 +15.365 -20.287 174.963 +0.000 0000 0 +15.893 -19.620 +14.836 -20.955 +15.365 -20.120 +15.365 -20.455
04=BXO 02 +11.600 -39.141 156.109 +0.000 0000 0 +11.620 -37.109 +10.500 -41.174 +11.600 -37.608 +11.600 -40.674
05=DAO 05 +05.616 -57.810 137.440 +0.000 0000 0 +07.249 -54.564 +03.983 -61.570 +05.616 -54.764 +05.616 -60.857
06=AX_ 01 -16.423 +74.242 269.492 +0.000 0000 0 -16.132 +74.741 -16.715 +73.744 -16.423 +74.240 -16.423 +74.243
07=CSO 06 -11.804 +59.442 254.692 +0.000 0000 0 -10.305 +63.105 -13.304 +55.778 -11.804 +62.905 -11.804 +55.978
08=HS_ 02 -07.173 -15.119 180.131 +0.000 0000 0 -06.216 -14.104 -08.130 -16.133 -07.173 -14.605 -07.173 -15.634
20250411.gzd

Chromosphere (H-α) FITS frames

H-α

The images are made automatically with a fixed, gentle rule: uneven illumination and most of the limb darkening are removed, and the brightness is shown on a linear scale (no sharpening); prominences get their own scale outside the limb. Frames are ordered by sharpness (seeing); frames without the Sun (darks, bias) come last. Method →

2025/20250411_ee · EE · 8 frames · 171.4 MB · 08:17:37–08:32:53 UT

08:17:37 UT · 30 ms 08:31:42 UT · 40 ms 08:31:06 UT · 30 ms 08:19:04 UT · 40 ms · over-exposed 08:25:44 UT · 50 ms · over-exposed 08:32:18 UT · 50 ms · over-exposed 08:32:53 UT · 60 ms · over-exposed 08:30:16 UT · 60 ms · over-exposed

Coronado H-α animations from frame sequences

No Coronado observation for this day.